/usr/lib/pd/extra/pdp/pdp_conv_alledge.pd is in pd-pdp 1:0.14.1-3+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #N canvas 245 202 522 199 10;
#X obj 29 17 inlet;
#X obj 29 156 outlet;
#X obj 29 97 pdp_conv;
#X msg 95 36 hmask 0.33 0.33 0.33;
#X msg 95 59 vmask -0.33 -0.33 -0.33;
#X obj 29 126 pdp_add;
#X obj 95 13 loadbang;
#X obj 292 34 int;
#X obj 292 56 * 2;
#X obj 292 79 - 1;
#X obj 292 12 inlet;
#X text 101 115 pdp_alledge is an all edge sensitive convolution filter
using pdp_add and pdp_conv to compose a non separable edge detection
convolution mask (pdp_conv can only compute separable convolution masks).
the right inlet sets number of times the filter is run (2n-1);
#X connect 0 0 2 0;
#X connect 0 0 5 1;
#X connect 2 0 5 0;
#X connect 3 0 2 0;
#X connect 3 0 4 0;
#X connect 4 0 2 0;
#X connect 5 0 1 0;
#X connect 6 0 3 0;
#X connect 7 0 8 0;
#X connect 8 0 9 0;
#X connect 9 0 2 1;
#X connect 10 0 7 0;
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